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Calculate the quantity of electricity needed to reduce one centimole of dichromate in acid medium to chromic state

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57900 coulomb

5790 coulomb

96500 coulomb

965 coulomb

answer is B.

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Detailed Solution

${Cr}_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 {Cr}^{3 +} + 7 H_{2} O \begin{array}{l} 1 mole {Cr}_{2} O_{7}^{2 -} = 6 \times 96500 c \\ 0.01 mole of {Cr}_{2} O_{7}^{2 -} = ? \\ ∴ 6 \times 965 C = 5790 C \end{array}$

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